CFD Rollover Costs - Am I missing something fundamental?

Been trading CFDs for a few months now, mostly on indices like $GER40 and some forex pairs like $EURUSD. I'm starting to get a grip on the leverage and margin side, but the overnight funding or rollover costs are still tripping me up. I understand it's a fee for holding positions past a certain time, reflecting interest rates and all that. But sometimes these fees, especially on longer holds, just eat into what would otherwise be decent profits, or worse, turn small wins into losses.

Is there a strategy to manage this effectively, beyond just closing trades before rollover? Are some brokers significantly better or worse on these rates, or is it pretty much standardized? What am I missing here that more experienced traders leverage to mitigate this, or is it just the cost of doing business with CFDs that I need to factor in more aggressively to my projected P&L?